12
UMC710D4_D00379_00_M_XXEN / 01.2020
System describtion
2. If the voltage at the end of the preferred supply falls below the set value or exceeds a
value of 115 % x Un, the module automatically changes over to the second supply (line
2): Once the set response time t(off) has elapsed, Q1 is disconnected and following the
set idle time t(K1-2), Q2 is connected and latched.
3. On voltage recovery on the preferred supply source, switching back to the preferred
supply source occurs automatically after the set return transfer time t(on) has elapsed:
Q2 is disconnected and following the set idle time t(K1-2), K1 resp. Q1 is connected and
latched.
i
The response time t(off), the idle time t(K1-2) and the return transfer time t(on) of the MEDICS®-
module can be set and must be adjusted according to the requirements of the specific applica-
tion case, the short-circuit calculation and the requirements of IEC 60364-7-710:2002-11, secti-
ons 556.5.2.2, 556.7 and 556.8 and DIN VDE 0100-710 (VDE 0100 Part 710):2002-11 section
710.537.6 (automatic changeover modules) (
see chapter „Commissioning, setting and tes-
The settings made at the factory on MEDICS® modules I
e
≤ 63 A ensure a changeover period of t ≤
0.5 s and switching back within five seconds on voltage recovery on the preferred supply.
Therefore, the UMC710D4-.. can also be used in IT systems with a requirement for a changeover
period t ≤ 0.5 s (IT systems with operating theatre lighting circuits, endoscopic field illumination
in operating theatres, or other essential sources of light, etc.).
For changeover modules with I
e
≥ 100 A, the idle time is factory set to at least 500 ms. Therefore,
the factory-set total changeover time for modules above 100 A is ≥ 0.8 s and meets the require-
ments for a changeover period of < 15 s. In this way, overvoltages due to fast switching operati-
ons can be avoided. The response time t(off) and idle time t(K1-2) must be adjusted according to
the requirements of the specific application case.
If the control device detects a supply line failure or a fault, a message appears on the LC display,
the LED „ALARM“ lights up, the alarm relay switches and this alarm is transmitted to other Bender
devices (such as alarm indicator and test combinations) via the BMS bus.
2.5.2 Version UMC710D4-..-HA
Version UMC710D4-..-HA additionally offers the following possibilities:
1. This version is designed to be operated with the alarm indicator and operator panel
TMX-HA. That additionally allows manual operation of the changeover module which is
required, for example, for revision procedures. When operated in manual mode, an
alarm message occurs on the module or via BMS bus on associated remote alarm indi-
cators and test combinations or TM... operator panels. The alarm indicator and operator
panel TMX-HA is not included in the scope of delivery.
2. “Internal conditions are assigned to relay contacts and are available as potential-free
switching contacts for forwarding to a building control system. Alternatively, messages
can be assigned to specific relays. That requires the setting of specific parameters on
the PRC487.
3. Switching back interlocking (
